Not a keyboard, but I started using a Logitech G13 game pad about 8 months ago and I love it. Aside from a few rarely used key commands my keyboard is just for typing now. I also recently purchased an Evoluent vertical mouse (trying to head off some RSI) which has 6 programable buttons so I've really be able to create a more tailored, ergonomic setup for myself.

I love using the KB covers for my standard MAC keyboard. This way I can have a Premiere cover, an After Effects cover, and so on. They look awesome, protect the keyboard, and are a fraction of the price of dedicated keyboards. Clients can't even tell they're just covers.